Abstract 1. IN THE KNOWN PROCESS COMPRISING SOLUTION SPINNING POLYACRYLONITRILE HOMOPOLYMERS OR COPOLYMERS CONTAINING AT LEAST 80% BY WEIGHT OF ACRYLONITRILE AND UP TO 20% BY WEIGHT OF ONE OR MORE VINYL MONOMERS THROUGH A ROUND ORIFICE INTO A FIRST BATH TO SUPERFICIALLY COAGULATE THE FIBER; PASSING THE SUPERFICIALLY COAGULATED FIBER INTO A SECOND BATH; WASHING THE FIBER; STRETCHING THE FIBER; AND DRYING THE FIBER; WHEREIN THE SPINNING SOLUTION AND SAID FIRST AND SECOND BATHS ALL CONTAIN A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN AQUEOUS SALINE SOLVENT, AN AQUEOUS SALINE SOLVENT CONTAINING AN ALIPHATIC ALCOHOL CONTAINING LESS THAN 6 CARBON ATOMS; DIMETHYL ACETAMIDE, DIMETHYL FORMAMIDE, AND DIMETHYL SULFOXIDE; AND THE IMPROVEMENT WHICH COMPRISES FORMING HOLLOW FIBER WITHOUT THE ADDITION OF FOAMING AGENTS BY SPINNING SAID SOLUTION INTO SAID FIRST BATH WHEREIN THE CONCENTRATION OF THE SELECTED MEMBER IS MAINTAINED IN AN AMOUNT OF 5 TO 65% BY WEIGHT IN 95 TO 35% BY WEIGHT WATER AND THE TEMPERATURE OF SAID FIRST BATH IS MAINTAINED AT -20 + 25*C., AND MAINTAINING THE FIBER IN SAID FIRST BATH FOR FROM ABOUT 13 TO ABOUT 40 SECONDS AND THEREAFTER PASSING THE SUPERFICIALLY COAGULATED FIBER INTO SAID SECOND BATH WHEREIN THE CONCENTRATION OF SAID SELECTED MEMBER IS MAINTAINED IN AN AMOUNT LESS THAN THAT IN THE FIRST BATH AND LESS THAN 35% BY WEIGHT IN MORE THAN 65% WATER AND THE TEMPERATURE OF SAID SECOND BATH IS MAINTAINED AT 30 TO 120*C AND MAINTANING SAID FIBER IN SAID SECOND BATH FROM ABOUT 1 TO 15 SECONDS.
IN THE KNOWN PROCESS COMPRISING SOLUTION SPINNING POLYACRYLONITRILE HOMOPOLYMERS OR COPOLYMERS CONTAINING AT LEAST 80% BY WEIGHT OF ACRYLONITRILE AND UP TO 20% BY WEIGHT OF ONE OR MORE VINYL MONOMERS THROUGH A ROUND ORIFICE INTO A FIRST BATH TO SUPERFICIALLY COAGULATE THE FIBER; PASSING THE SUPERFICIALLY COAGULATED FIBER INTO A SECOND BATH; WASHING THE FIBER; STRETCHING THE FIBER; AND DRYING THE FIBER; WHEREIN THE SPINNING SOLUTION AND SAID FIRST AND SECOND BATHS ALL CONTAIN A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN AQUEOUS SALINE SOLVENT, AN AQUEOUS SALINE SOLVENT CONTAINING AN ALIPHATIC ALCOHOL CONTAINING LESS THAN 6 CARBON ATOMS; DIMETHYL ACETAMIDE, DIMETHYL FORMAMIDE, AND DIMETHYL SULFOXIDE; AND THE IMPROVEMENT WHICH COMPRISES FORMING HOLLOW FIBER WITHOUT THE ADDITION OF FOAMING AGENTS BY SPINNING SAID SOLUTION INTO SAID FIRST BATH WHEREIN THE CONCENTRATION OF THE SELECTED MEMBER IS MAINTAINED IN AN AMOUNT OF 5 TO 65% BY WEIGHT IN 95 TO 35% BY WEIGHT WATER AND THE TEMPERATURE OF SAID FIRST BATH IS MAINTAINED AT -20 + 25*C., AND MAINTAINING THE FIBER IN SAID FIRST BATH FOR FROM ABOUT 13 TO ABOUT 40 SECONDS AND THEREAFTER PASSING THE SUPERFICIALLY COAGULATED FIBER INTO SAID SECOND BATH WHEREIN THE CONCENTRATION OF SAID SELECTED MEMBER IS MAINTAINED IN AN AMOUNT LESS THAN THAT IN THE FIRST BATH AND LESS THAN 35% BY WEIGHT IN MORE THAN 65% WATER AND THE TEMPERATURE OF SAID SECOND BATH IS MAINTAINED AT 30 TO 120*C AND MAINTANING SAID FIBER IN SAID SECOND BATH FROM ABOUT 1 TO 15 SECONDS.
Claim 2
Dependent Claim
252 words
IN THE KNOWN PROCESS COMPRISING SOLUTION SPINNING POLYACRYLONITRILE HOMOPOLYMERS OR COPOLYMERS CONTAINING AT LEAST 80% BY WEIGHT OF ACRYLONITRILE AND UP TO 20% BY WEIGHT OF ONE OR MORE VINYL MONOMERS THROUGH A ROUND ORIFICE INTO A FIRST BATH TO SUPERFICIALLY COAGULATE THE FIBER; PASSING THE SUPERFICIALLY COAGULATED FIBER INTO A SECOND BATH; WASHING THE FIBER; STRETCHING THE FIBER; AND DRYING THE FIBER; WHEREIN THE SPINNING SOLUTION AND SAID FIRST AND SECOND BATHS ALL CONTAIN A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN AQUEOUS SALINE SOLVENT, AN AQUEOUS SALINE SOLVENT CONTAINING AN ALIPHATIC ALCOHOL CONTAINING LESS THAN 6 CARBON ATOMS; DIMETHYL ACETAMIDE, DIMETHYL FORMAMIDE, AND DIMETHYL SULFOXIDE; AND THE IMPROVEMENT WHICH COMPRISES FORMING HOLLOW FIBER WITHOUT THE ADDITION OF FOAMING AGENTS BY SPINNING SAID SOLUTION INTO SAID FIRST BATH WHEREIN THE CONCENTRATION OF THE SELECTED MEMBER IS MAINTAINED IN AN AMOUNT OF 5 TO 65% BY WEIGHT IN 95 TO 35% BY WEIGHT WATER AND THE TEMPERATURE OF SAID FIRST BATH IS MAINTAINED AT -20 + 25*C., AND MAINTAINING THE FIBER IN SAID FIRST BATH FOR FROM ABOUT 13 TO ABOUT 40 SECONDS AND THEREAFTER PASSING THE SUPERFICIALLY COAGULATED FIBER INTO SAID SECOND BATH WHEREIN THE CONCENTRATION OF SAID SELECTED MEMBER IS MAINTAINED IN AN AMOUNT LESS THAN THAT IN THE FIRST BATH AND LESS THAN 35% BY WEIGHT IN MORE THAN 65% WATER AND THE TEMPERATURE OF SAID SECOND BATH IS MAINTAINED AT 30 TO 120*C AND MAINTANING SAID FIBER IN SAID SECOND BATH FROM ABOUT 1 TO 15 SECONDS.